Messages in this thread | | | Date | Mon, 19 Sep 2022 22:20:47 -0700 | Subject | Re: [PATCH bpf-next v2 3/3] bpf: Move nf_conn extern declarations to filter.h | From | Martin KaFai Lau <> |
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On 9/19/22 12:44 PM, Daniel Xu wrote: > We're seeing the following new warnings on netdev/build_32bit and > netdev/build_allmodconfig_warn CI jobs: > > ../net/core/filter.c:8608:1: warning: symbol > 'nf_conn_btf_access_lock' was not declared. Should it be static? > ../net/core/filter.c:8611:5: warning: symbol 'nfct_bsa' was not > declared. Should it be static? > > Fix by ensuring extern declaration is present while compiling filter.o. > > Fixes: 864b656f82cc ("bpf: Add support for writing to nf_conn:mark") > Signed-off-by: Daniel Xu <dxu@dxuuu.xyz> > --- > include/linux/filter.h | 6 ++++++ > include/net/netfilter/nf_conntrack_bpf.h | 7 +------ > 2 files changed, 7 insertions(+), 6 deletions(-) > > diff --git a/include/linux/filter.h b/include/linux/filter.h > index 75335432fcbc..98e28126c24b 100644 > --- a/include/linux/filter.h > +++ b/include/linux/filter.h > @@ -567,6 +567,12 @@ struct sk_filter { > > DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key); > > +extern struct mutex nf_conn_btf_access_lock; > +extern int (*nfct_btf_struct_access)(struct bpf_verifier_log *log, const struct btf *btf, > + const struct btf_type *t, int off, int size, > + enum bpf_access_type atype, u32 *next_btf_id, > + enum bpf_type_flag *flag); > + > typedef unsigned int (*bpf_dispatcher_fn)(const void *ctx, > const struct bpf_insn *insnsi, > unsigned int (*bpf_func)(const void *, > diff --git a/include/net/netfilter/nf_conntrack_bpf.h b/include/net/netfilter/nf_conntrack_bpf.h > index d1087e4da440..24d1ccc1f8df 100644 > --- a/include/net/netfilter/nf_conntrack_bpf.h > +++ b/include/net/netfilter/nf_conntrack_bpf.h > @@ -5,6 +5,7 @@ > > #include <linux/bpf.h> > #include <linux/btf.h> > +#include <linux/filter.h>
The filter.h is only needed by nf_conntrack_bpf.c? How about moving this include to nf_conntrack_bpf.c. nf_conntrack_bpf.h is included by other conntrack core codes. I would prefer not to spill over unnecessary bpf headers to them. The same goes for the above bpf.h and btf.h which are only needed in nf_conntrack_bpf.c also?
> #include <linux/kconfig.h> > #include <linux/mutex.h>
Also, is mutex.h still needed?
> > @@ -14,12 +15,6 @@ > extern int register_nf_conntrack_bpf(void); > extern void cleanup_nf_conntrack_bpf(void); > > -extern struct mutex nf_conn_btf_access_lock; > -extern int (*nfct_btf_struct_access)(struct bpf_verifier_log *log, const struct btf *btf, > - const struct btf_type *t, int off, int size, > - enum bpf_access_type atype, u32 *next_btf_id, > - enum bpf_type_flag *flag); > - > #else > > static inline int register_nf_conntrack_bpf(void)
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